Extreme fussiness after 1 year shots

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SoOo we had 1 year shots this morning and he was fine upuntill about a hour ago 😩 now suddenly he started crying inconsolably for a good half hour till he finally fell to sleep 😭

He’s always been pretty great after shots soOo I’m pretty thrown with this . His legs are not swelled or anything else like that bc I did a whole check over.

Anyways did any one else experience this reaction with their one year shots?